381 



Hatching, grasshopper eggs, 36. 

 Heading of wheat, '265. 

 Heat and chlorophyl, 3J<, 75. 



fractional parts, 223, 232. 



germination, 137. 



harvest, 23. 



plant development, 221. 



respiration, 19, 48. 



ripening of grain, 73. 



solar, and latitude, 91, 219. 

 Heer, climatic zones, 221. 

 Heidelberg, Germany, insolation, 82. 



intensity of sunshine, 93. 



plant development, 231. 

 Heiden, germination and light, 44. 

 Heinrich, crops and water, 119. 

 Hellriegel, fixation of nitrogen, 136, 151-155. 



shade and plant development, 79. 



water and crops, 117. 

 Helmersen, fruit trees, 231. 

 Henry, phenological observations, 292. 

 Heraeus, fixation of nitrogen, 139. 

 Heredity and acclimatization, 295-308. 

 Herodotus, climate of Assyria, 296. 

 Himalayas, grasses, 299. 



sun temperatures, 238. . 

 Hochgebirge, sun temperatures, 238. 

 Hoehner, transpiration, 112. 

 Hoffmann, phenological investigations, 



phenological notation, 291. 



thermal constants, 174. 

 Holter, grasses, 311. 

 Hooker, black-bulb temperatures, 238. 

 Hop vines, pruning, 341. 

 Horse chestnut, phenology, 280. 

 Hough, phenology, 5. 



Houghton Farm, N. Y., soil temperatures, 63, 66. 

 Humboldt, germination, 45. 



phenology, 72. 



sunshine, 169. 

 Hunt, germination, 307. 



maize experiments, 334, 335. 

 Huron, S. Dak., meteorological data, 320-330. 

 Hydrocarbons, 17. 

 Hygrometric data, 273. 



Iberis amara, germination, 28-36. 

 Iceland, acclimatization, 217. 

 Ihne, phenological notation, 291. 

 Illonkoff, crops and water, 116. 

 Illinois, maize experiments, 334-335. 

 "Inclosure" of the thermometer, 238. 

 Indiana, maize experiments, 331. 

 Ineffective temperatures, 34-36. 

 Ingenhousz, germination, 42. 

 Initial date, 238. 



point in phenology, 168-189, 213, 214, 218. 



temperature, 279-290. 

 Inoculation of soils, 136-161. 

 Insolation, measurement, 82, 90, 91. 



compensation, theory of, 219. 

 Instructions, phenological, 291. 

 International Meteorological Tables, 101. 

 Irkutsk, Siberia, cereals, 187. 

 Irrigation, 23, 234. 



acclimatization, 362. 



crop yield, 116. 



Isanthesic lines, 184. 189, 278. 

 Isochimenal lines, 72. 

 Isophenological lines, 242. 

 Isotheral lines, 72. 

 Isothermal lines, 72, 



Japan, soil temperatures, 54. 

 Java, climatic zone, 225. 

 Jensen, wheat smut, 341. 

 Jordan, sunshine recorder, 99. 

 Joulie, fertilizer, 246. 



fixation of nitrogen, 150. 



Kabsch, phenological formula, 173. 

 Kalm, acclimatization of maize, 220. 

 Kansas, oats, 337. 



sorghum, 337. 

 Keith, germination, 43. 

 Kentucky blue grass, 307. 

 Kew, atmospheric electricity, 131. 



insolation, 82. 



photochemical researches, 93, 94. 

 Khiva, Central Asia, plant development, 231. 

 Kidney beans, transpiration, 71. 

 Kief, Russia, plant development, 231. 

 Kiel, Germany, intensity of sunlight, 95. 

 Knight, pruning and tuber development, 80. 

 Koppen, germination, 335. 

 Kraus, pruning, 341. 



Krakow, Austria-Hungary, fixation of nitro- 

 gen, 154. 

 Kupffer, limit of cultivation, 187. 



Laboratory, climatic, 24-27. 

 Lachmann, thermal constants, 173. 

 Ladd, fertilizers, 163. 



grasses, 310. 

 Lambert's formula, 84. 



Langenthal, pruning and tuber development, 80 

 Laplace, sunshine, 84. 

 Lapland, acclimatization, '2'20. 



phenology, 186. 

 Latitude, and plant development, 242. 



ripening, 243. 



solar heat, 91. 



vegetation, 183-186, 218. 

 Laurent, fixation of nitrogen, 150,151. 



plant nutrition, 77. 

 Lausanne, phenology, 186. 

 Lavoisier, light and plants, 37. 

 Lawes, evaporation, 245. 



fertilizers, 145. 



fixation of nitrogen, 151. 



nitrogen in rain, 135. 



plat experiments, 3.55. 



soil nitrogen, 142. 



sources of nitrogen, 137. 



transpiration, 113. 

 Lazenby, plat experiments, 355. 

 Leafing, epoch of, 181, 185, '238, 278-290. 



of vine, 256. 



temperature, 172. 



thermal con.stant, '2'26,'291,293. 

 LeClerc, germination, 43. 

 Lef^bure, germination, 35, 43. 

 Legumin, 49, 51. 

 Leguminosae, fixation of nitrogen, 136,151-161. 



tubercles on, 151. 



